A consumer's decision to rely on a friend to act as an agent depends, in part, on beliefs about the friend's knowledge. Three studies examine the role of motivational and cognitive biases in estimating friends' personalized knowledge (e.g., knowledge of one's movie preferences). Results show that estimates of close friends' knowledge are less accurate than those of less close friends for personalized but not for impersonal knowledge. Specifically, the studies show more overestimation of personalized knowledge and more bias in integrating new information for close as opposed to less close friends, supporting a motivational explanation for miscalibration of personalized knowledge.
Johar, Gita, and Andrew Gershoff. "Do You Know Me? Consumer Calibration of Friends' Knowledge." Journal of Consumer Research 32 (March 2006): 496-503.
Each author name for a Columbia Business School faculty member is linked to a faculty research page, which lists additional publications by that faculty member.
Each topic is linked to an index of publications on that topic.